\[\frac{3y}{4y - 4} + \frac{2y}{5 - 5y} =\]
\[= \frac{3y^{\backslash 5}}{4(y - 1)} - \frac{2y^{\backslash 4}}{5(y - 1)} =\]
\[= \frac{15y - 8y}{20(y - 1)} = \frac{7y}{20y - 20}.\]